Controlling the microstructure and mechanical properties of Ti-6Al-4V via friction stir welding
- Li J.Z. ,
- Dong C.L. and
- Luan G.H.
- Li J.Z. ,
- Dong C.L. and
- Luan G.H.
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Friction stir welding was employed to fabricate butt joints in Ti-6%Al-4%V sheets (thickness 2 mm) and the effect of process parameters on joint microstructure and plastic deformation behaviour was investigated. Welding experiments were conducted at rotational speeds of 120-400 rpm, a welding speed of 50 mm/s and a tilt angle of 2.5 deg. Butt joint microstructure was observed by optical microscopy and TEM. Mechanical properties were characterised by hardness measurements and tensile tests. Issues discussed include the formation of ultrafine and complex grained microstructures at low and high heat input, respectively, stir zone microstructures at different rotational speeds and superplasticity deformation behaviour.
10th International Symposium, 20-22 May 2014, Poster Session, Paper 04
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